Does the yaesu ft 1000 mp Mkv 's really fry amps ?

Discussion in 'Ham Radio Discussions' started by KF7TFO, Dec 5, 2012.

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  1. KF7TFO

    KF7TFO XML Subscriber QRZ Page

    I would really like buy the ft1000mp Mkv ,but have heard about the initial power frying amps. I have an ALS 600 amp and hoped to use the class A 75 watts as the exciter. I only run ssb,voice. Any thoughts ? thanks KF7TFO chuckarseneau@gmail.com
     
  2. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

    See answer for your previous post.
     
  3. KF6ABU

    KF6ABU Ham Member QRZ Page

  4. KF7TFO

    KF7TFO XML Subscriber QRZ Page

    so what would YOU do ? get the field version with 100 watts ? or for a few more pennies get the ft2000 ?
     
  5. WA7PRC

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    Neither. I'll continue to use my TS850S. Compared to a rig with a properly designed and operated Class AB PA, there's no significant advantage to using a rig that has a Class A PA.
     
  6. WB2WIK

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    I had a MK V for a few years and it was a "nice" rig to operate; however unless modified, they all have issues.

    One issue that's difficult to recognize until you put it side by side with a better receiver is, its receiver just really isn't very good. Under contest conditions, strong stations seem wider than they really are, the noise blanker pumps and creates pretty bad artifacts, etc. Using it "alone" it's hard to tell. I placed it next to my TS-850S using a 50 Ohm power divider to run the antenna connection to both of them and tuned around on both for a couple of hours before I decided that MK V either needs serious work or it's going up for sale.

    And it wasn't just "mine," they're all like that. Transmitted IMD isn't good, either (but then, neither is the TS-850S, frankly -- wasn't one of Kenwood's best efforts when it comes to transmitter IMD). I have two neighbors who used MK V's for a while: Dave WA6DKN and Neil K6SMF. Both close, LOS for our antennas. They both always seemed "wide" to me, no matter what receiver I used. When Dave dumped his and started using an IC-7800, wow! -- what a difference. His signal is still 60/S9, but now he's so "narrow" I can work stations only 3 kHz up or down the band from him, which I couldn't do before. Same thing happened with Neil, when he ditched his and started using a K3. Neil's only 1 mile from me and has five towers with monobanders on them, which I can see from my driveway. He's very strong, but now so "clean" it's a pleasure to share a band with him.

    So my recommendation would be: Unless the MK V's been well modified to reduce those issues, or you want to do that yourself, don't buy it.:eek:
     
  7. KF7TFO

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    Thank you for that you just saved me a lot of greif !!! Being new to this is frustrating some times,but yourself :eek: and others support is marvelous ! MERRY CHRISTMAS AND THANK YOU AGAIN !!!!!!!
     
  8. WA7PRC

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    I'm curious if you know of any hard evidence (e.g. spectrum analysis or tabulated data) to back this up.
     
    Last edited: Dec 7, 2012
  9. WB2WIK

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    Yeah, check QST July 1991 issue, pages 43-44. They actually went out of their way to comment on the fairly mediocre TX IMD performance, and it's been well verified over dozens of units.

    Also check QST April 1992 issue, page 68, where they tested the TS-450S and comment how much cleaner it is for TX IMD than it's "bigger brother," the TS-850S.:eek:

    I have an 850S and it's a good rig, but I just about never use it at 100W output power. I drive my amp with ~60-65W from the 850S and it does seem cleaner there. That's good, because that's all the drive my amp needs.:p
     
  10. WA7PRC

    WA7PRC Premium Subscriber QRZ Page

    Thanks. I found the article. It's interesting what they said about IMD on fone. Yeah, it's not great. FWIW, in the five years I've had mine, no one has complained to me about splatter. Yet. The good news is, using Morse, IMD is zero. ;)

    I've never bothered to monitor drive power to my amplifier. On fone, I drive it to just below where it clips, as shown by the monitor oscilloscope. On Morse, I drive it to no more than the I[SUB]GRID[/SUB] limit.
     
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